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II M. TRIGGS AND W D. REDRUP.

DUPLEX REGISTER BOOT. APPLICATION FILED MAR. 22, I918.

Patented July 2.2, 1919.

1 vSATES PATENT t me.

JAMES M. TRIGGS ANn WILLIAM B. REDRUP, F HUNTINGTON, INDIANA, AssIc oRs T0 rHE-MAJEsTIc COMPANY, or HUNTINGTON, INDIANA, A CORPORATION. or I1\T- DIANA.

Specification of Letters Patent.

DUPLEX-REGISTER BOOT.

Patented July 22, 1919.

Application filed March 22, 1918. Serial N 0. 223,968.

To all whom it may concern:

Be it known that We, JAMES M. TRIGGS and WILLIAM D. REDRUP, citizens of the United States, and residents of Huntington, in the county of Huntington and State of Indiana, have invented a certain new and useful Duplex-Register Boot; and we do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to hot air heating systems, and particularly to those of the type employing combined hot air outlet and cold air return registers, as disclosed in United States Letters Patent No. 1,152,864, issued September 7th, 1915, to James M. Triggs.

The object of our invention is the provision of an improved boot for use in connection with registers of the class described, which boot is simple and inexpensive in construction, capable of being easily and quickly installed and adapted to conduct the hot air to and the cold air from registers of the duplex type.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereofis illustrated in the accompanyin drawings, in which,

igure 1 is a perspective view of a boot embodying the invention, and Fig. 2 is an enlarged central vertical section thereof in connection with a register of the duplex t e.

lteferring to the drawings, 1 designates a register of the duplex type, having the center hot air outlet passage 2 and the two cold air inlet passages 3, 3 at opposite sides of the hot air passage. This register is customarily mounted on the floor 4 over an opening therein, and a boot 5, embodying the present invention, is disposed below the floor with its upper end extending into and filling the floor opening.

The boot is provided interlorly with the downwardly extending center passage 6 and wlth the opposite side passages 7, 7, which register at their upper ends respectively wlth the center hot air passage 2 and the side cold air passages 3, 3 of the register in a manner to form continuations of the register passages. Thecenter or hot air passage 6 of the boot has its lower end terminating short of the bottom of the boot and closed to the passages 7 and is provided in one of its outer side walls with an outwardly flanged opening 8 with which a pipe leading from a furnace or other suitable source of hot air supply may be connected. The side cold air passages 7, 7 of the boot extend below and communicate under the bottom of the center passage 6 and have a common outwardly flanged outlet opening 9 in the bottom of the boot, which flange is intended to be connected by a pipe to the cold air inlet of a furnace. The bottom 10 of the boot extends downward in conical restricted form to the opening 9.

The walls 11 forming the hot air passage 6 are of double form, in the present instance, with an interposedasbestos lining to prevent dissipation of the heat through said walls.

It is evident that we have provided a boot of unitary construction for use in connection with registers of the duplex type, which boot is adapted to connect the respective hot and cold air passages of the register with the hot and cold air pipes of a furnace in a simple, efficient and economical manner, and that it is capable of being easily and quickly installed.

We wish it understood that our invention is not limited to any specific construction, arrangement or form of the parts, except in so far as such limitations are specified in the claim.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is,-

A boot of the class described, comprising a casing open at its top and having a downwardly converging bottom with an outlet opening at its center, partitions disposed in spaced relation transversely of said casing and connected at their lower ends in vertically spaced relation to said bottom opening, said partitions being joined at their side edges to opposite side Walls of said casing inlet opening near its bottom intermediate to cooperate with the casing to form a censaidside passages.

tral passage and opposite side passages all In testimony whereof we have hereunto 10 open at their tops with the side passages exsigned our names to this specification.

5 tending under the bottom of the central passage and communicating with said bottom 7 JAMES M( TRIGG'SQ opening, said central passage having a side WILLIAM D. REDRUP.

Copies of this patent may be obtained for five cents, each, by addressing the Commissioner of Patents,

Washington, D. G. 

